Model 212-HD is a two-channel amplifier. Channel one has two inputs, bright switch, volume, treble, mid-range and bass controls. Channel two features two inputs, bright switch, volume, treble, mid-range, bass, reverb, tremelo intensity and tremelo speed controls. A deep switch, master gain control and power reduction switch operate on both channels. A dual foot switch is supplied for remote control of reverb and tremelo functions. The amplifier also has an extension speaker jack and an impedance switch for selection of either four or eight OHM loads.